Listen Technologies LR-400 User manual

LR-400 Operation Instructions
Make Sure the Unit is On
Rotate the volume knob counterclockwise with on earphone or headset connected to the unit.
Listen receivers use the coble of the earphone or headset as a receiving antenna.
Be careful when turning the unit on -if you turn the knob too for you might get too much
volume in your earphone!
Select a Channel
Select the channel to match the transmission channel by pressing the UP and DOWN buttons on the receiver. Listen
recommends the use of wide bond channels.
At72 MHz:
72 MHz receivers operate on 17 wide bond channels and 40 narrow bond channels.
Channels represented by letters on the display (i.e. A) ore wideband channels;
channels represented by numbers ore narrowband channels.
At216MHz:
216 MHz receivers operate on 19 wide bond channels and 38 narrow bond channels.
Channel numbers starling with a "2" ore wide bond; channels beginning with a "1" or "3" are narrow band channels.
Refer to the Frequency Compatibility Tables (pages 47-48) for specific frequencies and compatibility with other
manufacturers.
Test the audio
If a transmitter is broadcasting on that channel, you will be able to hear the audio. If the signal is too weak, the audio
will be muted (squelched).
Find an audio transmission using SEEK
Another way to find a channel on the LR-400 is to use the SEEK button. When you do this, the Listen receiver looks for
the next active channel. Sometimes the unit will mistake interference for a real broadcast signal. If you get interference.
press the SEEK button again. The unit may stop on a channel that is close to the actual broadcast channel. in which case
the channel will sound noisy or distorted. Simply press SEEK again until you find the clearest operating channel.

Adjust the volume control
Use the control dial on the top of the unit to adjust the volume to a comfortable level.
Volume Control Dial
To lock into Only One Channel
Press and hold the SEEK button for 5 seconds to lock a receiver onto the currently tuned
channel. Press and hold the button again to unlock. When locked the LED on top of the unit will flash when you press
the SEEK button.
Is the Channel Locked on My Receiver?
On the LR-400, when the channel is locked, the padlock icon will appear on the display. lf the unit is locked, the red LED
on the lop of the unit will flash when you press the SEEK button.
Padlock appears when locked
If locked, LED flashes on oil portable receivers when SEEK button is pressed
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